Jul 10, 2015 · Since ZFS utilizes algorithms to track frequently used data in addition to recently used data, your cache devices will still provide performance improvements after a backup. …

Mar 24, 2022 · ARC/ZIL are terms used to describe ZFS’s ram cache. ARC is a read cache, much like the regular Unix caching mechanism, but where Unix typically uses a LRU algorithm, …

Feb 18, 2025 · One is Adaptive Replacement Cache (ARC), which uses the server memory (RAM). The other is second level adaptive replacement cache (L2ARC), which uses cache …

Sep 11, 2021 · zfs_arc_max; zfs_arc_sys_free; By default, TrueNAS has zfs_arc_max as 0, which defaults to 50%. zfs_arc_sys_free is interesting because it tells zfs to keep at least this …

Mar 4, 2016 · To improve read performance, ZFS utilizes system memory as an Adaptive Replacement Cache (ARC), which stores your file system’s most frequently and recently used …

Jan 4, 2023 · I have a little bit of performance problem with ZFS. I have a system with mixed hard drive and some spare NVMe (although just consumer grade and can be a red flag even …

Jun 9, 2020 · I having problem with ZFS cache taking 11.9 of 14 MB of memory. How can I point ZFS cache to use ssd instead. My Freenas box configuration 1. Dell Pentium(R) Dual-Core …

Also whats about my ZFS-RAM usage: Can I expect to reduce it in that way? ZFS will try to use all RAM up to the specified limit. Changing pool config doesn't change this behaviour. In fact, …

Jun 27, 2023 · Just a correction, ZFS does not use memory (ram) as “traditional” write-back cache. This would create a risk for data integrity if a system lost power. Edit: Yes, ZFS …

Aug 25, 2021 · The way ZFS works: There is a read cache, ARC, in RAM. It can be increased in size with L2ARC in SSD, but get the ARC stats before you do: If your working set fits into …